TpTrayUtility.Components.ImageViewPort.OnMouseDown C# (CSharp) Method

		protected override void OnMouseDown(MouseEventArgs e)
		{
			if (e.Button != MouseButtons.Left) return;

			_dragPointID = _shapeControl.GetPoint(MouseToReal(e.Location));
			if (_dragPointID >= 0)
			{
				return;
			}

			Primitive overPrimitive = GetPrimitiveAt(MouseToReal(e.Location));
			if (overPrimitive != null &&
			    (ModifierKeys == Keys.Shift ||
			     (SelectedPrimitive == overPrimitive && _selectedTool == PrimitiveTool(overPrimitive)) ||
			     _selectedTool == TpTool.Select))
			{
				if (SelectionExists)
					SelectedPrimitive.ShapeToolLost();
				SelectedPrimitive = overPrimitive;
				_shapeControl.Dragging = true;
				UpdateCurrentTool();
				Invalidate();
			}
			else
			{
				if (ModifierKeys == Keys.Shift)
					return;
				if (SelectionExists)
				{
					SelectedPrimitive.ShapeToolLost();
					ResetSelectedPrimitive();
					Invalidate();
				}
				_isPenDown = true;
				if (_selectedTool == TpTool.FreeLine)
				{
					_currentPrimitive = new FreeLine();
				}
				else if (_selectedTool == TpTool.Line)
				{
					_currentPrimitive = new Line();
				}
				else if (_selectedTool == TpTool.TextBox)
				{
					_currentPrimitive = new DecoratedTextBox();
				}
				else if (_selectedTool == TpTool.Box)
				{
					_currentPrimitive = new Box();
				}
				else if (_selectedTool == TpTool.Select)
				{
					_currentPrimitive = null;
				}

				if (_currentPrimitive != null)
					_currentPrimitive.CreationMouseDownHandler(MouseToReal(e.Location));
			}

			if (!SelectionExists)
				RemoveAllProperties();
		}